21225489570 has 288 divisors, whose sum is σ = 62547593472. Its totient is φ = 4975229952.

The previous prime is 21225489559. The next prime is 21225489577. The reversal of 21225489570 is 7598452212.

21225489570 is a `hidden beast` number, since 2 + 1 + 22 + 54 + 8 + 9 + 570 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (21225489577) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 45843159 + ... + 45843621.

It is an arithmetic number, because the mean of its divisors is an integer number (217179144).

Almost surely, 2^21225489570 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21225489570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31273796736).

21225489570 is an abundant number, since it is smaller than the sum of its proper divisors (41322103902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21225489570 is a wasteful number, since it uses less digits than its factorization.

21225489570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 21225489570 in words is "twenty-one billion, two hundred twenty-five million, four hundred eighty-nine thousand, five hundred seventy".